Spindle reciprocating mechanism



Feb. 9, 1932. c. OTT ET AL SPINDLE RECIPROCATING MECHANISM Filed Aug. 13, 1929 2 Sheets-Sheet 2 NM m w -l Q H I 1 IQW: mu .[IH m W! M I QM "i In h kw w m S 7/ 2% V w m r w x m .i

J JLM m a m M l W Patented Feb. 9, 1932 cone-An L. OIT Ann HAROLD E. netsien SIGNORS TO LANDIs TOOL COMPANY, ronarron or PENNSYLVANIA R, OE VTAYNESBORO, PENNSYLVANIA, A 01 WAYNESBORO, PENNSYLVANIA, A GOR- SPINDLE REGIPROCATING MECHANISM Application filed August 13, 1529. Serial No. 385,603.

Our invention relates to mechanism for imparting a reciprocating movement to a ro-' tating spindle and is designed primarily for reciprocat ng the wheel spmdleof a grind ing machine. y An object of the invention is to provlde new and improved means for varying the distancejthrough which the spindle reciprocates and for cushioning the connection between the driving means and the spindle reciprocating mechanism. i

A further object is to provide means for quickly stopping the spindle reciprocating driving means.

Further objects and advantages will become apparent. as the description proceeds.

Referring to the accompanying drawings which are made a. part hereof and on which similar reference characters indicate similar parts i Figure l is a-sectional front elevation of aportion of the wheel base of a grinding machine, V

Figure 2 is a section on line 2'2 of Fig. 1,

Figure 3 is a sectional side elevation through the wheel base showing details of our device, and

Figure 1 is an isometric View showing an adjustable eccentric disk for reciprocating the spindle.

In the drawings reference character 10 in dicates a wheel base for a grinding machine in which is rotatably mounted a spindle 11 on which a grinding wheel, not shown, may

mechanism when it is disconnected from the be mounted. Numeral 12 indicates a bracket in which is mounted a set of bearings in which the shaft 11 is rotatably carried. Bracket 12 is mounted on a base portion 13 in which it slides. A guide abutment'ltto which is secured a bracket 15 holds the.

bracket 12 in place. The spindle 11 has a drlving gear 16 mounted thereon, wh ch gear meshes with and drives a gear 17 on a shaft H The gear17 isresiliently secured to the shaft 18 which shaft is parallel with the shaft 11.

18 by means of a spring 19 which is passed through the shaft and secured to the hub of thegear 17 at 20 and 21. Driving connection between the shaft lland the shaft 18 is therefore cushioned by means of the spring 19. This prevents a sudden jar to the reciprocatingmechanism which would other wise be given it due to the inertia of the wheel spindle and the heavy grinding wheel which is mounted on it.

Shaft 18 has a worm gear 22 which meshes with a worm wheel 23 which latter wheel is 1nounted to rotate freely on a shaft 24. The worm wheel 23 has a clutch element 25 on one face which is engageable by a correspondingclutch 26 on one end of a spool 27 the .otherend of this spool has clutch teeth 28 which are engageable with teeth 29 on a plate 30 which is secured to the wheel base 10. The spool 27 is keyed to the shaft 24 so as to rotate the shaft but is permitted axial movement along the shaft to bring the teeth 26 or 27 into engagement with the teeth 25 or teeth 29as desired. The spool 27 is axially moved along the shaft by means of abar 31 having a knob 32 on its forward end. This bar has a bracket or finger 33 securedto it which finger extends between the disks on the spool by which the spool is engaged to be moved axial- 1y of the shaft 24. The bar 31 has notches 34 and 35. engageable by a spring-pressed ball latch 36, the latch serving to hold the spool in position to hold theteeth engaged with the stationary plate 30 or with the rotating gear 23. The front end of the shaft 20 is mortised to fit a slot 39 in an eccentric block 37, the block 87 being held on the end of the shaft 24 by means of a screw 38. The slotis somewhat longer than the diameter of the shaft so that the position of the eccentric block on the shaft may be varied to vary the eccentricity of the disk 37 with respect to the shaft 24. The disk 37 fits in a socket in a yoke 40 which is pivotally secured at 41 to the bracket ,12. A cap 42 is secured to the yoke by means of screws 43 for holding the disk in the yoke. I

The operation of the device is as follows: The spindle 11 is driven by any suitablemech anism for-driving the grinding wheel. When the operator wishes to reciprocate the wheel 11 he pulls the knob 32 outwardly until it is y "tum.

teeth 26 in engagement with the teeth 25 on the worm wheel 23. This worm wheel is driven from the shaft 11 through the gears 16 and 17, the gear 17 being resiliently keyed to the shaft 18. The driving connection just described rotates the shaft 24 on the end of w iich is an eccentric disk 37, which disk upon. rotating moves the yoke 40 to reciprocate the spindle l by means of bracket 12.

ciprocating a wheel spindle which is very simple in construction and which provides suitable resilient drive between the driving mechanism and the heavy reciprocated mechanism.

It will be obvious to those skilled in the art that various changes maybe made in our device without departing from the spirit of the invention and we, therefore, do not limit ourselves to what is shown in the drawings and described in the specification but only indicated in the appended claims.

Having thus fully described our said invention, what we claim as new and desire to secure by Letters Patent, is:

1. In a grinding machine having a wheel base and a grinding wheel spindle rotatably mounted in the wheel base, a bracket secured to the spindle but allowing the spindle to rotate therein, a shaft parallel with the wheel spindle, resilient driving connection between the spindle and the said shaft, a second shaft and aneccentric on said second shaft, a yoke secured to the said bracket and having the eccentric operable in a socket therein, means for operatively connecting the second and the last-named shafts whereby rotation of the wheel spindle rotates the last-named shaft to effect reciprocation of the wheel spindle, and means for locking the last-named shaft against rotation upon its being disconnected from the driven shaft, substantially as set forth.

In a grinding machine having a grinding wheel base, a bracket slidably mounted in said base, a grinding wheel spindle mounted in said base and in said bracket, a driven shaft parallel with the wheel spindle, a resilient'driving connection between the wheel spindle and the driven shaft, a second shaft rotatably mounted'in the wheel base, a worm wheel loosely mounted on said shaft, driving connectionbetween the driven shaft and said worm wheel, means forlocking said worm wheel to the second shaft to impart rotary motion thereto, a yoke connected to the said bracket, an eccentric on the end of the second shaft engageable with the yoke whereby rotation of the second shaft will impart a reciprocating movement to the yoke to the bracket and to the wheel spindle, substantially as set forth.

.3. In a grinding machine having a grinding wheel base, abracket slidably mounted in said base, a grinding wheel spindle mounted in said base and in said bracket, a driven shaft parallel with the wheel spindle, a resilient driving connection between the wheel spindle and the driven shaft, a second shaft 'rotatably mounted in the wheel base, a worm wheel loosely mounted on said shaft, driving connection between the driven shaft and said worm wheel, means for locking said worm wheel to the second shaft to impart rotary motion thereto, a yoke connected to the said bracket, an eccentric on the end of the second shaft engageable with the yoke whereby rotation of the second shaft will impart a reciprocating movement to the yoke to thebracket and to the wheel spindle, and means operable to stop rotation of the second shaft when the worm wheel is disengaged from the second shaft, substantially as set forth.

In witness whereof, we have hereunto set' our hands at W aynesboro, Pennsylvania this 10th dayof August, A. D. nineteen hundred and twenty-nine.

HAROLD E. BALSIGER. CONRAD L. OTT. 

